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. 2014 Apr 3;19(4):4246–4255. doi: 10.3390/molecules19044246

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© 2014 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Scheme 1 — Synthesis of Ba₃Sar, Ba₇Sar, Ba₈Sar and Me-Ba(An(Boc))₂Sar.